Misdiagnosis and Delayed Diagnosis Claims in the US

The Standard: Differential Diagnosis

Direct Answer: Doctors are expected to consider the reasonable possibilities for a patient's symptoms, order appropriate tests and follow up on results. A failure to do so, rather than the wrong diagnosis itself, is what makes a claim.

Many conditions present with common symptoms, so a provider is not negligent merely for missing a rare cause. Claims arise where red-flag symptoms were ignored, abnormal results were not communicated, imaging was misinterpreted or a specialist referral that a competent provider would have made was not made.

Proving the Delay Caused Harm

You must show that earlier diagnosis would have changed the outcome, such as an earlier-stage cancer, a treatable rather than untreatable condition, or avoiding permanent damage. Some states apply a loss-of-chance doctrine that allows recovery when negligence reduced the chance of a better outcome, even below 50%, while others require proof that a better outcome was more likely than not. The rule in your state matters.

Deadlines

Many states run the limitation period from the date you discovered, or should have discovered, the injury and its likely cause, which is important where a misdiagnosis is only revealed later. Statutes of repose set an outer limit in many states regardless of discovery, so do not wait once you suspect a missed diagnosis.